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McNamara L, Waldron A, Thomas M, Jones W, O'Rourke P, Darrell S, Strange Fessler KA. Investigating the hydrolysis of cryogenically layered molybdenum hexafluoride through a disordered hydrogen-bonded network. Phys Chem Chem Phys 2023; 25:2990-2998. [PMID: 36606495 DOI: 10.1039/d2cp04147b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Molybdenum hexafluoride (MoF6) is used as a non-radioactive substitute for uranium to study the hydrolysis of metal hexafluorides. Molybdenum hexafluoride gas and water vapor, from the air, were sequentially layered onto a diamond substrate kept at liquid nitrogen temperature using a custom designed cryogenic cell with a copper cold finger. Reaction progress was monitored by transmission Fourier Transform Infrared Spectroscopy (FTIR) through the layers and diamond substrate over several hours while allowing the substrate to warm. Changes in the modes in the 500-1000 cm-1 region are tracked as the reaction progresses in order to identify intermediate species. Strong absorption features are also observed in the 1000-3000 cm-1 range, suggesting the presence of ionic dissociation intermediates trapped in a disordered H-bonded network of cryogenic hydrofluoric acid. A possible reaction pathway is proposed and the final hydrolysis product is characterized by FTIR, UV-vis, and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS).
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Affiliation(s)
- Louis McNamara
- Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA.
| | - Abigail Waldron
- Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA.
| | - Michael Thomas
- Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA.
| | - Willis Jones
- Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA. .,University of North Florida, 1 UNF Drive, Jacksonville, FL, 32224, USA
| | - Patrick O'Rourke
- Savannah River National Laboratory, 301 Gateway Drive, Aiken, 29803, SC, USA.
| | - Simmons Darrell
- Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, 37830, TN, USA
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2
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Khuu T, Anick D, Shultz MJ. Matrix Isolation Spectroscopy: Aqueous p-Toluenesulfonic Acid Solvation. J Phys Chem A 2018; 122:762-772. [PMID: 29292995 DOI: 10.1021/acs.jpca.7b08939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Interaction between p-toluenesulfonic acid (pTSA) and water is studied at -20 °C in a CCl4 matrix. In CCl4 water exists as monomers with restricted rotational motion about its symmetry axis. Additionally, CCl4 is transparent in the hydrogen-bonded region; CCl4 thus constitutes an excellent ambient thermal energy matrix isolation medium for diagnosing interactions with water. Introducing pTSA-nH2O gives rise to two narrow resonances at 3642 cm-1 and at 2835 cm-1 plus a broad 3000-3550 cm-1 absorption. In addition, negative monomer symmetric and asymmetric stretch features relative to nominally dry CCl4 indicate that fewer water monomers exist in the cooled (-20 °C) acid solution than in room-temperature anhydrous CCl4. The negative peaks along with the broad absorption band indicate that water monomers are incorporated into clusters. The 3642 cm-1 resonance is assigned to the OH-π interaction with a cluster containing many water molecules per acid molecule. The 2835 cm-1 resonance is assigned to the (S-)O-H stretch of pTSA-dihydrate. The coexistence of these two species provides insights into interactions in this acid-water CCl4 system.
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Affiliation(s)
- Thien Khuu
- Laboratory for Aqueous and Surface Studies, Tufts University , Pearson Building, Medford, Massachusetts 02155, United States
| | - David Anick
- Laboratory for Aqueous and Surface Studies, Tufts University , Pearson Building, Medford, Massachusetts 02155, United States
| | - Mary Jane Shultz
- Laboratory for Aqueous and Surface Studies, Tufts University , Pearson Building, Medford, Massachusetts 02155, United States
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3
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Vener MV, Chernyshov IY, Rykounov AA, Filarowski A. Structural and spectroscopic features of proton hydrates in the crystalline state. Solid-state DFT study on HCl and triflic acid hydrates. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1380860] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M. V. Vener
- Quantum Chemistry Department, Mendeleev University of Chemical Technology, Moscow, Russia
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - I. Yu. Chernyshov
- Quantum Chemistry Department, Mendeleev University of Chemical Technology, Moscow, Russia
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - A. A. Rykounov
- Theoretical Department, Russian Federal Nuclear Center – All-Russian Research Institute of Technical Physics (RFNC-VNIITF), Snezhinsk, Russia
| | - A. Filarowski
- Faculty of Chemistry, University of Wrocław, Wrocław, Poland
- Department of Physics, Industrial University of Tyumen, Tyumen, Russia
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4
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McDonald DC, Mauney DT, Leicht D, Marks JH, Tan JA, Kuo JL, Duncan MA. Communication: Trapping a proton in argon: Spectroscopy and theory of the proton-bound argon dimer and its solvation. J Chem Phys 2017; 145:231101. [PMID: 28010076 DOI: 10.1063/1.4972581] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ion-molecule complexes of the form H+Arn are produced in pulsed-discharge supersonic expansions containing hydrogen and argon. These ions are analyzed and mass-selected in a reflectron spectrometer and studied with infrared laser photodissociation spectroscopy. Infrared spectra for the n = 3-7 complexes are characterized by a series of strong bands in the 900-2200 cm-1 region. Computational studies at the MP2/aug-cc-pVTZ level examine the structures, binding energies, and infrared spectra for these systems. The core ion responsible for the infrared bands is the proton-bound argon dimer, Ar-H+-Ar, which is progressively solvated by the excess argon. Anharmonic vibrational theory is able to reproduce the vibrational structure, identifying it as arising from the asymmetric proton stretch in combination with multiple quanta of the symmetric argon stretch. Successive addition of argon shifts the proton vibration to lower frequencies, as the charge is delocalized over more ligands. The Ar-H+-Ar core ion has a first solvation sphere of five argons.
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Affiliation(s)
- D C McDonald
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - D T Mauney
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - D Leicht
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - J H Marks
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - J A Tan
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 10617, People's Republic of China
| | - J-L Kuo
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 10617, People's Republic of China
| | - M A Duncan
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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5
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Shi R, Huang X, Su Y, Lu HG, Li SD, Tang L, Zhao J. Which Density Functional Should Be Used to Describe Protonated Water Clusters? J Phys Chem A 2017; 121:3117-3127. [DOI: 10.1021/acs.jpca.7b00058] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruili Shi
- Key
Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, 116024, China
| | - Xiaoming Huang
- School
of Ocean Science and Technology, Dalian University of Technology, Panjin Campus, Panjin, 124221, China
| | - Yan Su
- Key
Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, 116024, China
| | - Hai-Gang Lu
- Key
Laboratory of Chemical Biology and Molecular Engineering of the Education
Ministry, Institute of Molecular Science, Shanxi University, Taiyuan, 030006, China
| | - Si-Dian Li
- Key
Laboratory of Chemical Biology and Molecular Engineering of the Education
Ministry, Institute of Molecular Science, Shanxi University, Taiyuan, 030006, China
| | - Lingli Tang
- College
of Science, Dalian Nationalities University, Dalian 116600, China
| | - Jijun Zhao
- Key
Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, 116024, China
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6
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Cheng B, Ceriotti M. Direct path integral estimators for isotope fractionation ratios. J Chem Phys 2014; 141:244112. [DOI: 10.1063/1.4904293] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Kulig W, Agmon N. Both Zundel and Eigen Isomers Contribute to the IR Spectrum of the Gas-Phase H9O4+ Cluster. J Phys Chem B 2013; 118:278-86. [DOI: 10.1021/jp410446d] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Waldemar Kulig
- The Fritz Haber Research
Center, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Noam Agmon
- The Fritz Haber Research
Center, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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8
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Kalish NBM, Shandalov E, Kharlanov V, Pines D, Pines E. Apparent stoichiometry of water in proton hydration and proton dehydration reactions in CH3CN/H2O solutions. J Phys Chem A 2011; 115:4063-75. [PMID: 21417385 DOI: 10.1021/jp110873t] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gradual solvation of protons by water is observed in liquids by mixing strong mineral acids with various amounts of water in acetonitrile solutions, a process which promotes rapid dissociation of the acids in these solutions. The stoichiometry of the reaction XH(+) + n(H(2)O) = X + (H(2)O)(n)H(+) was studied for strong mineral acids (negatively charged X, X = ClO(4)¯, Cl¯, Br¯, I¯, CF(3)SO(3)¯) and for strong cationic acids (uncharged X, X = R*NH(2), H(2)O). We have found by direct quantitative analysis preference of n = 2 over n = 1 for both groups of proton transfer reactions at relatively low water concentrations in acetonitrile. At high water concentrations, we have found that larger water solvates must also be involved in the solvation of the proton while the spectral features already observed for n = 2, H(+)(H(2)O)(2), remain almost unchanged at large n values up to at least 10 M of water.
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9
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Baer M, Marx D, Mathias G. Assigning Predissociation Infrared Spectra of Microsolvated Hydronium Cations H3O+⋅(H2)n (n=0, 1, 2, 3) by Ab Initio Molecular Dynamics. Chemphyschem 2011; 12:1906-15. [DOI: 10.1002/cphc.201000955] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 02/02/2011] [Indexed: 11/07/2022]
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10
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Fast protonic conductivity in crystalline benzenehexasulfonic acid hydrates. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-010-1094-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Guasco TL, Johnson MA, McCoy AB. Unraveling Anharmonic Effects in the Vibrational Predissociation Spectra of H5O2+ and Its Deuterated Analogues. J Phys Chem A 2011; 115:5847-58. [DOI: 10.1021/jp109999b] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Timothy L. Guasco
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Mark A. Johnson
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
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12
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Douberly GE, Walters RS, Cui J, Jordan KD, Duncan MA. Infrared Spectroscopy of Small Protonated Water Clusters, H+(H2O)n (n = 2−5): Isomers, Argon Tagging, and Deuteration. J Phys Chem A 2010; 114:4570-9. [DOI: 10.1021/jp100778s] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- G. E. Douberly
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - R. S. Walters
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - J. Cui
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - K. D. Jordan
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - M. A. Duncan
- Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
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13
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Yang Y, Kühn O. A Full-Dimensional Quantum Dynamical Study of the Vibrational Ground State of H3O2
– and its Isotopomers. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.2008.5396] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
We investigated the effect of deuteration on the vibrational ground state of the hydrated hydroxide anion using a nine-dimensional quantum dynamical model for the case of J = 0. The propagation of the nuclear wave function has been performed with the multi-configuration time-dependent Hartree method which yielded zero-point energies for the normal and fully deuterated species in quantitative agreement with previous diffusion Monte Carlo calculations. According to the zero-point energy the isotopomers having the hydrogen atom in the bridging position are more stable by about 1 kJ/mol as compared to the deuterium case. This holds irrespective of the deuteration state of the two OH groups. We also report the secondary geometric isotope effect on the O–O distance upon replacing the H- by a D-bond. It amounts to a contraction by about 0.005 Å for the symmetric isotopomers and 0.009 Å in the asymmetric case.
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14
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Vener MV, Librovich NB. The structure and vibrational spectra of proton hydrates: as a simplest stable ion. INT REV PHYS CHEM 2009. [DOI: 10.1080/01442350903079955] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Kaledin M, Kaledin AL, Bowman JM, Ding J, Jordan KD. Calculation of the Vibrational Spectra of H5O2+ and Its Deuterium-Substituted Isotopologues by Molecular Dynamics Simulations. J Phys Chem A 2009; 113:7671-7. [DOI: 10.1021/jp900737r] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Martina Kaledin
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, Georgia 30144
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16
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Siuda P, Uras-Aytemiz N, Sadlej J. Microsolvation of HCl within Cold NH3 Clusters. J Phys Chem A 2008; 112:11423-30. [DOI: 10.1021/jp802687u] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paweł Siuda
- Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Turkey, and Department of Chemistry, University of Warsaw, Pasteur 1, 02-093 Warsaw, Poland
| | - Nevin Uras-Aytemiz
- Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Turkey, and Department of Chemistry, University of Warsaw, Pasteur 1, 02-093 Warsaw, Poland
| | - Joanna Sadlej
- Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Turkey, and Department of Chemistry, University of Warsaw, Pasteur 1, 02-093 Warsaw, Poland
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17
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McCunn LR, Roscioli JR, Elliott BM, Johnson MA, McCoy AB. Why Does Argon Bind to Deuterium? Isotope Effects and Structures of Ar·H 5O 2 + Complexes. J Phys Chem A 2008; 112:6074-8. [DOI: 10.1021/jp802172q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laura R. McCunn
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Joseph R. Roscioli
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Ben M. Elliott
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Mark A. Johnson
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Anne B. McCoy
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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18
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Antonchenko VY, Kryachko ES. Interaction of uranyl ion with few molecules of water: thought (computational) scenarios with hydrogen bonding motif. Theor Chem Acc 2008. [DOI: 10.1007/s00214-008-0417-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Buch V, Dubrovskiy A, Mohamed F, Parrinello M, Sadlej J, Hammerich AD, Devlin JP. HCl hydrates as model systems for protonated water. J Phys Chem A 2008; 112:2144-61. [PMID: 18288820 DOI: 10.1021/jp076391m] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio molecular dynamics simulations are presented of vibrational dynamics and spectra of crystal HCl hydrates. Depending on the composition, the hydrates include distinct protonated water forms, which in their equilibrium structures approximate either the Eigen ion H3O+(H2O)3 (in the hexahydrate) or the Zundel H2O...H+...OH2 ion (in the di- and trihydrate). Thus, the hydrates offer the opportunity to study spectra and dynamics of distinct species of protonated water trapped in a semirigid solvating environment. The experimentally measured spectra are reproduced quite well by BLYP/DZVP-level calculations employing Fourier transform of the system dipole. The large overall width (800-1000 cm-1) of structured proton bands reflects a broad range of solvating environments generated by crystal vibrations. The aqueous HCl solution was also examined in search of an objective criterion for separating the contributions of "Zundel-like" and "Eigen-like" protonated forms. It is suggested that no such criterion exists since distributions of proton-related structural properties appear continuous and unimodal. Dipole derivatives with respect to OH and O...H+ stretches in water and protonated water were also investigated to advance the understanding of the corresponding IR intensities. The effects of H bonding and solvation on the intensities were analyzed with the help of the Wannier centers' representation of electron density.
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20
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Ayotte P, Plessis S, Marchand P. Trapping proton transfer intermediates in the disordered hydrogen-bonded network of cryogenic hydrofluoric acid solutions. Phys Chem Chem Phys 2008; 10:4785-92. [DOI: 10.1039/b806654j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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McCunn LR, Roscioli JR, Johnson MA, McCoy AB. An H/D Isotopic Substitution Study of the H5O2+·Ar Vibrational Predissociation Spectra: Exploring the Putative Role of Fermi Resonances in the Bridging Proton Fundamentals. J Phys Chem B 2007; 112:321-7. [DOI: 10.1021/jp075289m] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Laura R. McCunn
- Sterling Chemistry Laboratory, Yale University, P. O. Box 208107, New Haven, Connecticut 06520
| | - Joseph R. Roscioli
- Sterling Chemistry Laboratory, Yale University, P. O. Box 208107, New Haven, Connecticut 06520
| | - Mark A. Johnson
- Sterling Chemistry Laboratory, Yale University, P. O. Box 208107, New Haven, Connecticut 06520
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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22
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Buch V, Mohamed F, Parrinello M, Devlin JP. Elusive structure of HCl monohydrate. J Chem Phys 2007; 126:074503. [PMID: 17328616 DOI: 10.1063/1.2436870] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The study addresses the structure of crystalline HCl monohydrate which is composed of H3O+ and Cl-. The published x-ray diffraction patterns indicate an element of disorder, the nature of which is debated in the literature and is addressed in the present study. The computational investigations include searches for alternative crystal structures employing an empirical potential, and on-the-fly simulations as implemented in the density functional code QUICKSTEP employing Gaussian basis sets. The experimental work focuses on Fourier-transform infrared (FTIR) spectra of crystal nanoparticles. Simulations of FTIR spectra and of the x-ray diffraction patterns are consistent with crystal monohydrate structure composed of ferroelectric domains, joined by "boundary tissue" of antiferroelectric structure.
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Affiliation(s)
- V Buch
- The Fritz Haber Institute for Molecular Dynamics, The Hebrew University, Jerusalem 91904, Israel.
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23
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Devlin J, Buch V, Mohamed F, Parrinello M. The amorphous analogs of the crystalline monohydrate of HCl: Structures and spectra. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.11.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Korzeniewski C, Snow DE, Basnayake R. Transmission infrared spectroscopy as a probe of Nafion film structure: analysis of spectral regions fundamental to understanding hydration effects. APPLIED SPECTROSCOPY 2006; 60:599-604. [PMID: 16808860 DOI: 10.1366/000370206777670620] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Transmission infrared spectroscopy was applied to investigate properties of the perfluorosulfonated polymer Nafion. Measurements were made on thin films formed by casting the polymer from solution onto ZnSe windows. Effects of water vapor permeation were studied. A complex band structure between 1350 and 1100 cm(-1) was analyzed qualitatively by fitting the region to Gaussian functions. Features associated with vibrational modes of -CF(2) and -SO(3)(-) groups were identified and observed to be sensitive to film hydration. The intensities of bands for the -SO(3)(-) modes increased with film hydration, while bands assignable to -CF(2) modes decreased. The results were applied to interpret infrared difference spectra of Nafion and shed light on the complicated features that appear. Vibrational bands for water were also examined. In partially hydrated films, the stretching mode of the free -OH group for interfacial water present in pores and channels of the polymer and bands for hydrated proton clusters were detected.
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Affiliation(s)
- Carol Korzeniewski
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA.
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25
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Woutersen S, Bakker HJ. Ultrafast vibrational and structural dynamics of the proton in liquid water. PHYSICAL REVIEW LETTERS 2006; 96:138305. [PMID: 16712045 DOI: 10.1103/physrevlett.96.138305] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Indexed: 05/09/2023]
Abstract
The dynamical behavior of excess protons in liquid water is investigated using femtosecond vibrational pump-probe spectroscopy. By resonantly exciting the O-H+-stretching mode of the H9O4(+) (Eigen) hydration structure of the proton and probing the subsequent absorption change over a broad frequency range, the dynamics of the proton is observed in real time. The lifetime of the protonic stretching mode is found to be approximately 120 fs, shorter than for any other vibration in liquid water. We also observe the interconversion between the H9O4(+) (Eigen) and H5O2(+) (Zundel) hydration structures of the proton. This interconversion, which constitutes an essential step of proton transport in water, is found to occur on an extremely fast (< 100 fs) time scale.
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Affiliation(s)
- Sander Woutersen
- FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
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26
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Uras-Aytemiz N, Devlin J, Sadlej J, Buch V. HCl solvation in methanol clusters and nanoparticles: Evidence for proton-wires. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.02.064] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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McCoy AB. Diffusion Monte Carlo approaches for investigating the structure and vibrational spectra of fluxional systems. INT REV PHYS CHEM 2006. [DOI: 10.1080/01442350600679347] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Anick DJ. Proton and deuteron position preferences in water clusters: an ab initio study. J Chem Phys 2005; 123:244309. [PMID: 16396539 DOI: 10.1063/1.2139669] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In order to explore the effect of H-to-D substitution on the zero-point energy (ZPE) of water clusters, Hessians were computed for a database of 53 optimized (H2O)n clusters, 5 < or = n < or = 21, at the B3LYP6-311 + + G** level. The 53 clusters contained 1524 protons, which were sorted into 18 categories according to the type of their donor O and (if not free) acceptor O. Letting deltaZPE[H]* denote the change in ZPE when the proton H* is replaced by D, mean values for deltaZPE[H*] for the H-bonded categories ranged from -2172 cal mol(-1) for H* in a DDAA-DDAA bond to -2118 for H* in a DAA-DDA bond. Mean value for H* free on DAA (respectively, DA) was -2018 (respectively, -1969). For DAA-DDA bonds, and for short H bonds in general, there was a strong inverse correlation between /deltaZPE[H*]/ and the O-H* distance. deltaZPE for multiple H-to-D substitutions was additive, except for a cooperativity effect of -13.7 to -19.7 cal mol(-1) when two substituted protons were in the same H2O unit and a much smaller cooperativity when one proton's donor was the other's acceptor. Implications of these data include a relative preference for D to occupy H bonded rather than free positions in finite water clusters, a value of 3.82 for the disproportionation equilibrium constant of mixed ice at 150 K, increased occupation by H at surface positions of mixed ice, and a larger average coordination number for liquid D2O than for liquid H2O.
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Affiliation(s)
- David J Anick
- Harvard Medical School, Harvard University, McLean Hospital, Belmont, Massachusetts 02478, USA.
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Lin Y, Chen X. Investigation of moisture diffusion in epoxy system: Experiments and molecular dynamics simulations. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.07.022] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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